Drugs that prevent the production of testosterone may do more harm than good to prostate cancer patients older than 66, U.S. researchers found after reviewing medical records for more than 19,000 Medicare patients. Those who underwent hormone therapy had about the same survival rate as those who took medication. Nearly 20% of men under drug therapy died from prostate cancer during the next six years, compared with 17% of men under medical monitoring who delayed or received no treatment.

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